Staying fit provides an even greater sense of satisfaction and accomplishment than levying a progressive sales tax on the neighbor kid's lemonade stand. Turn lemons into a lemon-flavored fitness drink with today’s Groupon: for $39, you get a six-month membership to JillianMichaels.com (a $104 value).

Jillian Michaels, a strength trainer and life coach best known for her drill-sergeant persona on The Biggest Loser and Losing It With Jillian, firmly commands the science, psychology, and commitment necessary to cast unwanted pounds into the ether. A six-month membership includes a cardio and fitness program based on your individual fitness level, prescribing a weekly workout regimen that doesn't require a gym, oversize hamster wheel, or backyard ice luge.

Customized meal guidelines with healthy recipes and menus ensure adorable pats of butter in need of shelter and a crust of bread don't lead devoted dieters astray. Jillian also shares motivational mantras and nuggets of health wisdom gleaned from 18 years of calorie-crushing know-how. Throughout their half-year fitness foray, weight-loss warriors can track their progress with helpful web tools and bask in the support of the site’s online community.